Maxima Racing Oils 40-03901 V-Twin Sporster Gear/Chain Oil - 32 fl. oz. Maxima Sportster Gear & Chain case Oil is a high-quality, mineral based motorcycle gear oil formulated for high-performance transmissions and primary chain cases Recommended for use in 1971 and newer XR and XL H-D motorcycles where transmission and primary chain case share a common lubricant Extreme pressure additives and surface active chemistry protect against shock loads and allow smooth shifting under peak loads and RPMs Robust formula resists mechanical shearing and heat breakdown of the oil Ultra-clean detergents protect gears from wear, deposits and allow for trouble-free operation